Letterbox Lab Kids Science Subscription Box Perfect for the inquisitive kid in your life, the Letterbox Lab Investigate Box (£24) brings science kits to their home. This bumper box includes six to nine big experiments/projects and collectable lab equipment for ages 8 and up, or there's the Letterbox Lab Explore Box (£10) with three to four experiments for ages 6 and up. Image Source: letterboxlab.com Letterbox Lab Investigate Box £24 from letterboxlab.com Buy Now Letterbox Lab Explore Box £10 from letterboxlab.com Buy Now